I've used Grizzlies a lot, and I've sold boatloads more. If I could only have one broadhead it would be a Grizzly, although I enjoy using lots of different heads.
It is true the tolerances are not on a par with say Magnus, but they are great heads. Grizzlies don't cost as much either, although both are very affordable.
Over the years I've had 1 with a ferrule out of whack, but I've had a Magnus with the same problem as well. In manufacturing, sometimes things just don't quite go as planned.
Anyway, I think they are good broadheads. I am fond of saying, "If you can't kill it with a Grizzly, you can't kill it with a bow!" :D